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Note 10 - Collaborative and Other Research and Development Contracts (Details Textual) - USD ($) $ in Thousands			1 Months Ended			9 Months Ended	12 Months Ended	42 Months Ended	43 Months Ended
	Jun. 16, 2015	Feb. 28, 2006	Jan. 31, 2007	Jun. 30, 2006	Jun. 30, 2000	Sep. 30, 2018	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Mar. 31, 2015	Nov. 11, 2011
CSL Limited [Member
Milestone Payment Received									$ 12,000
Royalty Term	10 years
Base Contract [Member]
Government Contract Receivable										$ 16,265
Additional Development Options [Member]
Government Contract Receivable										22,855
ASPRBARDA Contract [Member]
Government Contract Receivable										$ 39,120
Proceeds from awards for Research and Development Contracts								$ 20,574
Green Cross Corporation [Member]
Proceeds from License Fees Received				$ 250
Mundipharma [Member]
Upfront Payments Receivable Amount		$ 10,000
Potential Milestone Payments Receivable											$ 15,000
AECOM and IRL [Member]
Milestone Payment Minimum					$ 1,400
Milestone Payment Maximum					4,000
Annual License Fee Minimum					150
Annual License Fee Maximum					$ 500
Advance Notice Period for Termination of Agreement					60 days
National Institute of Allergy and Infectious Diseases [Member]
Collaborative Agreement Contract Value			$ 5,000
Expected Receivable From Awards for Research and Development Contracts							$ 43,035
UAB [Member]
Period of Agreement						25 years
Renewable Period of Agreement						5 years

X

- Definition

Represents advance notice period for termination of agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents annual maximum license fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represent minimum annual license fee.

+ References

No definition available.

+ Details

Name:	bcrx_AnnualLicenseFeeMinimum
Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents collaborative agreement contract value.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents expected receivable from awards for research and development contracts.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents milestone payment maximum.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents milestone payment minimum.

+ References

No definition available.

+ Details

Name:	bcrx_MilestonePaymentMinimum
Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of milestone payment received.

+ References

No definition available.

+ Details

Name:	bcrx_MilestonePaymentReceived
Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents period of agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents potential milestone payments receivable based on possibility of future event payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents proceeds from awards for research and development contracts.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents renewable period of agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period of time between the date of the Agreement and its expiration.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents upfront payments receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of receivables that are derived from government contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68054760&loc=d3e55295-109406

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cash received from licensees for license fees during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585

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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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- Details

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- Details

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Namespace Prefix:
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- Details

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